Question 469823
  <pre><font face = "Tohoma" size = 4 color = "indigo"><b> 
Hi
{{{(x)/(x^2 - y^2) + (y)/(y^2 - x^2)}}}
{{{(x)/(x^2 - y^2) - (y)/(x^2 - y^2 )}}}
{{{((x-y))/((x-y)(x+y))}}}
  1/(x+y)